Send to

Choose Destination
PLoS One. 2014 Jun 27;9(6):e101176. doi: 10.1371/journal.pone.0101176. eCollection 2014.

A review of published analyses of case-cohort studies and recommendations for future reporting.

Author information

Medical Research Council Epidemiology Unit, University of Cambridge School of Clinical Medicine, Cambridge, United Kingdom.
École Nationale de la Statistique et de l'Administration Économique Paris Tech, Paris, France.
Department of Public Health and Primary Care, University of Cambridge School of Clinical Medicine, Cambridge, United Kingdom.
Medical Research Council Biostatistics Unit, Cambridge Institute of Public Health, Cambridge, United Kingdom.


The case-cohort study design combines the advantages of a cohort study with the efficiency of a nested case-control study. However, unlike more standard observational study designs, there are currently no guidelines for reporting results from case-cohort studies. Our aim was to review recent practice in reporting these studies, and develop recommendations for the future. By searching papers published in 24 major medical and epidemiological journals between January 2010 and March 2013 using PubMed, Scopus and Web of Knowledge, we identified 32 papers reporting case-cohort studies. The median subcohort sampling fraction was 4.1% (interquartile range 3.7% to 9.1%). The papers varied in their approaches to describing the numbers of individuals in the original cohort and the subcohort, presenting descriptive data, and in the level of detail provided about the statistical methods used, so it was not always possible to be sure that appropriate analyses had been conducted. Based on the findings of our review, we make recommendations about reporting of the study design, subcohort definition, numbers of participants, descriptive information and statistical methods, which could be used alongside existing STROBE guidelines for reporting observational studies.

[Indexed for MEDLINE]
Free PMC Article

Supplemental Content

Full text links

Icon for Public Library of Science Icon for PubMed Central
Loading ...
Support Center